You feel it the minute you put them on. The soft, plush cushions seal you in. Then you flip the switch and whoosh???the world fades away. And the music starts. The original noise cancelling headphones are back, with better world-class quiet (plus the new Aware Mode), shockingly light materials for premium comfort and proprietary acoustic technology for deep, clear audio. Bose QuietComfort?? 45 headphones???wireless headphones with the perfect balance of quiet, comfort and sound. Feels magical. But it???s not magic. It all starts with our Acoustic Noise Cancelling??? technology, the result of more than 50 years of research. We use tiny microphones hidden in the earcups to continuously measure, compare and react to outside noise. That noise is then cancelled with an opposite signal, resulting in fewer distractions???and more of your music. Use the button on the left earcup to choose from Quiet Mode for full noise cancelling or Aware Mode to let in some of your surroundings. Headphone Fea